Malicious PDF — malware analysis report

Static analysis result for SHA-256 1676c893570139a0…

MALICIOUS

PDF

80.3 KB Created: 2021-09-17 21:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 29a7069c571da2f7fb8390b691581e89 SHA-1: 58167d75c4d6884f5035ace24166ee55cc2d1a28 SHA-256: 1676c893570139a0a4f884d6210b77619425e655787ceaf468058f63c435ff60
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to various PDF files hosted on potentially compromised or disposable domains. The document also impersonates a cloud document sharing service, encouraging users to click a download button, which is a common social engineering tactic to trick users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://feldmann.pl/userfiles/file/jojevawerogisomi.pdf In PDF document text
    • http://hocomesun.com/upload/98993151315.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/74106938135.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/cmjqg6v9mpjcv9g9j1uu050ve5/33491563721.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/8812299112.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/fulifowex.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/nomelodepofuzu.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/e6d2c4e02272de051d0a26fb2abb9ad1/vipebesekisutipamedasonab.pdfIn PDF document text
    • http://preiswerte-unterkunft-papenburg.de/mediapool/99776782735.pdfIn PDF document text
    • http://qdjshg.com/files/file/96922987841.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/60580178481.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161307adbdb9a5---puxegefosowejerogebutide.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/vapapavofatevatejepagon.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140422394530---68805418837.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/loxivesonejagerodu.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/jegotaredawofobizevesoke.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/irjfqtsfireaoqhuf620gd02r4/lujajukol.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/9htsnjop30nnsmkrejf0ojr1abvbbk5e/zisezonamumak.pdfIn PDF document text
    • http://sparkpro.lv/content/file/bebikitedonokawezopoti.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/80903874792.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210917/file/tofigobipawuzegarula.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/reguzofudejepulikumane.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/lopefefixeker.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/nevozin.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/1526560041.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+read+epub+files+on+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD590 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA2 17188 bytes
SHA-256: c49f0e68d78c88d944719134e5d4f2d3874e20a20559a829216b314414cb9550
font_02_sfnt_off00011a52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A52 10808 bytes
SHA-256: 47e82c34f788b7b0c925d59c321fe6652fba98f8ee9eb68640d1e103340fd9f4

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